α-adrenergic blocking agent
Definition: a class of drugs that competes with α-adrenergic agonists for available receptor sites; some compete for both α1 and α2 receptors (phentolamine, phenoxybenzamine hydrochloride), whereas others are primarily either α1 (prazosin, terazosin) or α2 receptor blocking agents (yohimbine).
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Examples: glitazone, GI cocktail, etc.